Lock.



J. WHITE.

LOCK.

APPLICATION FILED MAY 15, 1908.

Patented Nov. 10, 1908.-

FIG. 4

INVENTOR J. WHITE 0., was nmcmu, u. c.

UNITED STATES rarianir marten.

JOHN WHITE, OF OHARLOTIETOWN, PRINCE EDWARD ISLAND, CANADA, ASSIGNO R TOHARRY RICHARDS MCLELLAN, OF ST. JOHN, CANADA.

LOCK.

Specification of Letters Patent.

Patented Nov. 10, 1908.

To all whom it may concern:

Be it known that I, J OHN IVHITE, of Charlottetown, in the county ofQueens, Province of Prince Edward Island, Canada, have invented certainnew and useful Improvements in Locks, of which the-following is aspeciiication.

My invention relates to improvements in looks, and particularly to hasplocks, and the objects of my invention are to provide a form of springlock which will be thrown into releasable engagement with the hasp, byinward pressure thereof, and which may be locked by a simple turningmovement of the locking member, whereby both the engaging and locking ofthe hasp can be accomplished with one hand, further objects being todevise certain improvements relating to the locking mechanism andapplicable to locks generally by means of which the tumbler may be moreeffectively locked in posi tion.

The invention is described more fully in the accompanying specificationsand drawings and the features of novelty specifically set forth in theclaims.

In the drawings, Figure 1 is an elevation of the exterior of the lock.Fig. 2 is a section along the lines 2-2, Fig. 1. Fig. 3 is an elevationof the rear side of the lock proper with the back of the casing removed.Fig. 41 is a sectional detail showing the key and locking tumblers inengagement with each other. Fig. 5 is a perspective view of one of thespring actuated locking tumblers. Fig. 6 is a perspective detail of thehead of the locking member.

In the drawings, like letters of reference indicate corresponding partsin each figure.

Referring to the drawings, A represents the hasp of suitableconstruction pivoted to the staple 10, and having an elongated aperture11 near the free end thereof. B represents the lock proper including acasing 12 with a removable back cover 13. C represents the pivotallysupported locking member having a shank 1st ournaled in the top andbottom of the casing and a head 15 protruding above the same. This headis formed with an upper edge 16 adapted to normally extend substantiallyparallel with the aperture 11 and with inclined cam surfaces 17, and 18,on each side thereof, the lower edges of which are adapted, normally, toextend over the edges of the aperture 11,

as shown in Fig. 1, the surface being so formed that when the hasp isinserted over the top edge of the head and pressed downwardly, the camsurface will cause the locking member to turn to permit the same to passthrough the aperture 11 until the end of the cam surfaces 17 and 18 arereached when the locking member, under spring actuation, will springback to the position shown in Fig. 1. The particular curvature necessaryon the cam surface on each side of the head, in order to effect thedesired movement will be more or spiral in form.

The spring actuation of the locking member may be effected in anydesired way, and in the embodiment illustrated, a locking arm D issecured to the shank l-l within the casing having a cam surface 19thereon against which a spring 20 bears, the spring being supported froma screw 21 extending through the casing.

Means are provided for effecting the locking of the member C, thesemeans being preferably thrown into operation by a simple turningmovement of the said menn ber, and in the embodiment illustrated,consisting of a plurality of spring-actuated tumblers 22, 22, 22, 22,pivoted on a screw 23 within the casing, and each having notches 24:adapted to engage a projection provided on the arm I), each of the saidtumblers having a separate spring 25 for actuating the same, one end ofwhich 0X- tends into a slot 26 in the tumbler and the said springs beingconnected to the screw 21 and bearing against the side of the casing.

Each of the tumblers 22 are of different widths and they are so formedthat their aperture 24: in each will only be in registration with eachother when their outer edges are out of registration. The release of thetumblers is effected through a key E adapted to extend through asuitable key hole 27 and a guiding aperture 28 and being formed withslots 29 and 30 to receive the edges of the longest tumblers, wherebywhen the said key is turned, it will swing the tumblers about theirpivot points, but will always maintain the apertures 2-1- inregistration with each other, owing to the fact that the edges of thelongest tumblers can extend into the slots 29 and 30. The action of thereleasing is shown in dotted lines in Fig. 3.

In order to prevent opening of the look by any other than the designedkey, it is necessary to pivot the tumblers sufiiciently close to theedge of the casing to cause the widest tumbler to abut the side of thecasing before the projection on the tumbler will be released, and thus,if a key were used which had not the slot to receive the edge of thislongest tumbler, the other shorter tumblers would not be moved out ofengaged position before the longest tumbler would abut the side of thecasing and prevent further movement.

It will be seen that the lock is exceedingly simple in operation, thepressure on the hasp alone serving to throw the spring catch intoengagement and then when the head is turned, the projection on thelocking arm is brought into engagement with the slots 2% in thetumblers, and when in this position, the head will be at substantiallyright angles to the aperture 11, in the hasp, and can only be releasedthrough the medium of the proper key.

The provision of the separately actuated, spring tumblers, makes itexceedingly diflicult to pick the lock, as to do this, it would benecessary to gage exactly the width and thickness of each of the lockingtumblers. It will also be evident that Variations in the thickness andwidth of the locking tumblers will necessitate diiferent shaped keys.

As many changes could be made in the above construction, and manyapparently widely different embodiments of my invention could be madewithout departing from the spirit or scope thereof, it is intended thatall matter contained in these specifications and drawings shall beinterpreted as illustrative, and not in a limiting sense. It is also tobe understood that the language of the following claims is intended tocover such generic and specific features of the invention hereindescribed, which, as a matter of language, might be said tobe includedthereby.

l/Vhat I claim as my invention is 1. The combination with the hasp, of aspring-actuated retaining member therefor, adapted to be sprung intoengagement by pressure of the hasp, and means for locking the retainingmember.

2. The combination with a hasp, of manually releasable, spring-actuatedretaining member therefor, adapted to be sprung into engagement byinward pressure of the hasp.

8. The combination with the hasp, of a rotatable spring locking memberadapted to be sprung into engagement by inward pressure of the hasp, andmeans thrown into operation by the turning of the locking member forlocking the same and preventing further movement until released.

4. The combination with a hasp, of a rotatable spring actuated, lockingmember therefor, an arm on the locking member, and spring-actuatedtumblers adapted to engage and lock the same when the said lockingmember is turned.

5. In a lock, the combination with the reciprocatory, rotatablymountedlocking member normally spring-held in releasable engagement, andadapted to remain unlocked so long as its reciprocatory movement is restrained within determined limits, of springactuated locking meansthrown automatically into operation by a turning movement of thereciprocatory member in excess of the said determined limits.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

JOHN WHITE. [L. s.] W'itnesses D. EDGAR SHAW, ARTHUR G. PEAKE.

